Improvement in sectional steam-generators



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G. MARSHALL, T. IBBOTSON & J. BAILEY.

` Sectional Steam-Generator.: No. 210,135. Egtentkd Nov. 19, 1878*.r

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G. MARSHALL, T. IBBOTSONL J. BAILEY. Sectional-Steam-Generator. No.210,135. lPate'f'e'aclA N'ov.'l9,"1`878.

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UNITED STAT-Es PATanni?.

GEORGE MARSHALL, THOMAS IBBOTSON, AND JOHN BAILEY, OF BELLEVILLE,ILLINOIS.

IMPROVEMENT IN SECTIONAL STEAM-GENERATORS.

Specification forming part of Letters Patent No. 210,135, dated November19, 1878; application filedl Apri] 20, 1878.

To all whom it 'may concern:

Be it known that we, GEORGE MARSHALL, THoMAs IBBo'rsoN, and JOHN BAILEY,all of Belleville, in the county-of St. Clair and State of Illinois,have invented a certain new and useful Improvement in SectionalSteam-Generators, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification.

Our improvement relates to that class of boilers for heating water andgenerating of steam which are constructed of cast sections.

Our improvement consists, first, in the construction of the separatesections, each of the central sections consisting of a pipe in form ofan inverted U, or with angular bends at top, and with open-endedhorizontal portions at bottom, extending transversely to the rest of thepipe, and serving to connect the sections together at bottom. Thesections are also similarly connected at the apex.

Our improvement also consists in combining with the cast sections, asdescribed, a circulating-pipe, placed concentrically in the lower partof each vertical leg of the section, said pipe being open at top, andhaving lateral openings near the bottom for the outward iow of water,which enters at top.

Our improvement also consists in combining with the described sections(which are placed centrally in the boiler) end sections, having theirlower ends connected by a horizontal pipe. In line with the pipes arescrew-plugs, to allow the introduction of an instrument in the cleaningout of the boiler. The plug-orifices supply a means for the support ofthe cores in casting and for their removal.

In the drawings, Figure l is a perspective view of the boiler proper,with half the front section broken away to show the interior. Fig. 2 isa front elevation of the boiler, showing half the boiler-casing.

A is the casing. This may be of metal,brick, or other material. B is thefire-door, and O the chimney. The boiler consists of end sections andcentral sections, differing in this, that the end sections have ahorizontal pipe connecting the lower ends together and the centralsections have no such connecting-pipe.

D D are the vertical portions of the sections, connected at top by anarched or straight crown-pipe, E, of the same size as the parts D. Thebore of pipe D D E may be of any suitable size. We have made it fourinches in diameter. The sections have at each foot and at the crowntransverse openended pipes. Those at the foot are marked F and that atthe crown G. These connecting pipes or orifices are faced off where theyconnect with those-of the adjoining section, so as to make a steam-tightjoint with lead or a gasket. Beside the parts F and G are perforatedlugs H, through which pass stay-bolts I, by which all the sections areheld together, the bolts extending from end to end of theboilcr.

J is a circulating-pipe, placed axially in each the vertical parts D ofeach section, and eX- tending down into the part F. These pipes are openat top to allow the inow of water,

and have openings j in the sides, at the lower ends, to allow theoutflow of the cooler water to take the place of the hotter waterflowing up through the annular space between the -pipes D and J. Thepipes J are held in position at top by teats d, cast upon the inside ofpipes D, and at the lower end they are held in place by the screw-plugsM, which enter the lower ends. These screwplugs, like the others shown,give means for the introduction of an instrument in cleaning thehorizontal and vertical pipes.

K are feed-water pipes communicating with pipes Ii. L is the steam-pipecommunicat ing with pipe G. N are horizontal pipes, found only in theend sections at front and back of the boiler. These pipes form acommunication between the feet of these sections from F to F.

The fire-grate O may be at the saine height as the pipes N and F, or thegrate maybe above or below this elevation. We prefer to put it somewhatabove the center of these pipes, to cause a more regular circulation ofthe water through all the pipes of the boiler, as there would be areservoir for the cooler water entering through the feed-pipe andreturned through the pipes J that would supply the upper current in thepipes D. v

P I? are flanges cast upon the sides of parts E, and meeting to form acrown-sheet to the fire-space R, said crown deecting the products ofcombustion and causing thexn to escape between the pipes D and at theends of the boiler before they reach the chimney.

We claim as our invention- 1. The cast sections having,` vertical legs DD, crown-pipe E, and transverse pipes F F and G, communicating fromsection to section in the boiler.

2. The combination, in a boiler, of the sections havng the parts D E FG, and the end sections having in addition the horizontal pipe orport-ion N.

3. The combination, with the cast sections GEORGE MARSHALL. THOMASIBBOTSON. J OHN BAILEY.

Witnesses:

F. W. DEIDESHEIMER, A. F. MILLER.

